package com.huaishushu.config;

import com.huaishushu.common.JacksonObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

/**
 * @Author HuaiShuShu
 * @Date 2023/5/27 23:51
 * @PackageName:com.huaishushu.config
 * @Description: TODO
 * @Version 1.0
 */


@Slf4j
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {


    /**
     * 设置静态资源映射
     * @param registry
     *
     * 此处视频中是将backend和front两个文件放在了resources下，并没有放在static中，导致springboot访问不到里面的资源，因此需要配置路径映射
     * registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/")表示，接收到关于/backend/**的请求时，则会去backend/中去访问资源
     *
     */

    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        log.info("开始进行静态资源映射......");
        registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/static/backend/");
        registry.addResourceHandler("/front/**").addResourceLocations("classpath:/static/front/");
    }


    /**
     * 扩张MVC框架的消息转换器
     * @param converters
     */
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        //创建消息转换器对象
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        //设置对象转换器,底层使用jackson将java对象转化为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        //将上面的消息转换器对象追加到mvc框架的转换器集合中,因为转换器集合中是有顺序的,所以我们需要将其索引设置位0,追加到最前面
        converters.add(0, messageConverter);
    }
}

